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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ba84e26ac612a43bea4a313831486eeaaf8b43f9c49e4bf911b8e68fe7f51e' 
  AND token = '31u+5XF2Ta+yI/dtdcttcilrwqIjocetzQ3+cey3rec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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