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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351e1cd1c2760b81b5344fc898e9a9c176d389a130654eab6a5597df6e891c4b' 
  AND token = 'blPaBR03TSF3DKoFCtG4MEIiPNucZyGIaTsQd8FkSuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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