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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737124e0ef2842af40b25b43b30bb90d56f8c3bb587314b93e3592e5a054dd19' 
  AND token = 'ow4MPCFkOFjlkfEqrGuz6nq9MliCPjZ4duRj1Il6DIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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