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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa21096250d13d82dd19828d01cdca02770ab8d800b5f940b51e4022b5dbb31' 
  AND token = 'J6xNdZPJOFNgXaMtPb6Esnqvg5kf0xi31BRfwqFItes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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