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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33e63640ac1fa5c74df45c9df6ef5ac4902f9d77bf049ddd752e2cd31f7b2e7' 
  AND token = '+dxLmzNJ6pS89H2Sqvq01HqfHhHwncLfGvraP/HgY78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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