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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c947fa5a6eead94e3ace6e4fa5ee788ea2d3492b609e8ea99e27a78f6f4b13e' 
  AND token = 'kKfeyc2eeAt6u2qhRuY1jzxeAgR+TKRWZ/xSIKlWA2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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