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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e3408d872154afa3161c1d30f4d1dc97a021d6613d8bb53bd83340e81224e3' 
  AND token = 'aQsGy7jcPPAd0Uu06f5dbOlWj5TIJ+sEWnGFdzc2oNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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