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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaf7ff92e1343c7f27dbe44b6bd31b3ac2d5c556396aa33ffb1951f27de6fbe' 
  AND token = 'lHM8Cw3L8nclcGEWk5W1qM3tNv9yvHNy5X3fYE4Iurg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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