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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ffaee3ce311a5624f83b4b2c2f8dc681c5f28c9178a95e815808b2caec1448' 
  AND token = 'ttL66aBGl1PSm692RGqfjQDBpw23/2QDzpujq6h9oU4=' 
  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"
    }
  }
}