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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9f8c67a63f0b9bce94439eca811ec1c4d4dc58afa1d02118eb47bf92044d24' 
  AND token = '4egt6b6S2bjEpiuJDobYFPs3ubAJpfwdgxKk/Jr6/7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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