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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8562b8103de3026682bd1be04b2db9d1806e22d340cb987a603dc052e5dc0b23' 
  AND token = 'zD9v+DF01R5+o2cIaMbnbm+Gxg843Cq7COEsE11PAME=' 
  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"
    }
  }
}