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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34176d119ed441738aaf7b097ee2ce1bef2e1683f13679f97a4b60a5f1a937a' 
  AND token = 'PJgJ96zDwWJIuQvmMZAKEsQ38httwqI2uIqi2c2hg/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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