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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7dd160f72a466e09d1d601bd28b83b5d63164b8bdeb543cce17fd1f8700565' 
  AND token = 'kn2ovtGNofHiAlwVQ6Psdf2yvfc2I71yr8DbCzD8lyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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