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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b93b14ec66e23f7f6f51b68ae9a1d939da5e381ac80b8f6b7b55410d70f79b0' 
  AND token = 'drxY6REKnv84JDgFDRkXA1+HHol2KIJulYOQSPFeyAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}