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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6c0263878e4919986cdd1d0109993c1fb5f7ee11aca5cd6c30a152d935f33a' 
  AND token = '5FP4/vApwaMs/bcWv+MpUEwaHTTrYYHw2x1x2qhMCOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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