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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf873dc78e6ec3c2e46ed6dd55b2d02c1762db6f451d2ad6eb741f5474f40245' 
  AND token = 'e7kx/ADzxHQszuGnNsei4eO8s8cVTI7M6ukYW6TWRmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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