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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a95d570c4d8cccc36cdd53c73a82c77e9a68bb0c0e4ffc3a3b4797e63019761' 
  AND token = 'GQ0UKA0hS8fz/OVA9GTRDc6am0bTe7feEFO+F0D7+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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