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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de1a004628e4ff6f94099591a3cd877d7e84925b9fee71faff71051f0d77423' 
  AND token = '51jP2u8j9EtvkI4yUvHSh5FGjpyD4bPX40lBaFVZQbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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