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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55979919ca3a8f4863ba7862c9a2457a6d2ba476639a73297012447a9a80fe54' 
  AND token = '8GW0fuu3DHH1TyOE0C7qdeaB9MDOsDcq3mXlbweoXI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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