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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e86a67234d9118928a99dabafdf8376d334e8ff694937aa7004e8d2f450f25' 
  AND token = '35nIwIbb0GQ13I3HKLGGbfEvLXaDGLEfAwV0dx3buYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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