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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1f5f70d298b2eae8a4014165af22ec8502a0ffbf52c59606ed79d0a569c448' 
  AND token = 'd9VvQougA+v9nM0Z0zz5Ga7r1SUYWI9Jzj3IpydKTR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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