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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5601f9f3485fa2391bac29a4cb9c9c1fcf40bc0dbcfe1697b9f77b4dc9c73b' 
  AND token = 'ShQbhwUnmlmE3qKQt5aojDhWCWrOm5may1+oaSCpzLQ=' 
  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"
    }
  }
}