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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d6540d157813b84c26142b033d94833d99017e13107974b24266d128194a6b' 
  AND token = 'L5bENRZBahQ6qy48nEovz8O1FSd4+IWqFYH3KNdyPnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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