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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5836a08bf1d832226b603d8bbc4534ae2dbdfc2c71dfb11a26f6905a022fe60d' 
  AND token = 'siJ3SF6wGx5x6EyypGOJORudv9ZQLve/1aNyQDcaShM=' 
  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"
    }
  }
}