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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fbdd366cbe672f1ae1cad91c91311ceabf2dde1d820e02daa3ebe00e8268da' 
  AND token = '31EFyM/y7SJdHec7kRrHVTRzzkZZ8yr5oO8l051bnRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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