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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f122aa5082cb9aa91866eb78efe4e8f1527f8013f62da33d0f7136b431fcefaa' 
  AND token = 'bLm8ZW4i0moPxKRQCdkTuAptJ9WTiC9ZGI7tVypAMPI=' 
  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"
    }
  }
}