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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f95cb9b07394756b8c6a8c4849a1ed0f5622d19de2be58ea97fb7476eb503c' 
  AND token = 'gs9ktLOxxj1rHMn3pDFYUCiOzC2zRaGePbWQ6OtaaF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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