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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d591af0460bd23460d67be2d1b39da24afe163dc1802d1db2beee457461f691' 
  AND token = '4bsC2f8rvzw50+hIBb0Wd2O7/l4Bn9KfQS78Hue97Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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