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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2131110d2f641e72e968427cc8f3c3911a327964d653a97285ed0643a7b4dd39' 
  AND token = 'bnte2yHP9S2TxIX4PRpaluiWOiHOTJ7Wi02wsZ3DWJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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