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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1f571341d654c3681a50e44b14a3e335aee26c80fdc3464c0d855a8995b4d1' 
  AND token = 'wK5gUu0qk26KzpUkNlf/R8KqucEjNgSLe9zYvbY/9l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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