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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105c81cc71bdd4e380d29d241ac846bb60c76d5c435cd0d2fa4c87042997c055' 
  AND token = '8PN455Yk3O9hiALGFw0k8A6Bx0WWE0vC5X3SeWTXFAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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