SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f0d6f03a1f2a4b73ac5b9a59117f90804dea3e700ab1e2136ef8aaff95cf70' 
  AND token = 'CGmJz3pjWXZb9NJwGTrKQNBXr7vsqzW1U6pxGMixFPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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