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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a796d4a0d8bc007a16457d358d0ed9d5ad0255be5aadcabd3590aac225d552' 
  AND token = '9ZQYIgbHTb268G03Ozd1LvLgmcI0aUdmEho/19ToEAo=' 
  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"
    }
  }
}