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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06e062436643e95bbbd271c52fa0d27c61eb34e4d26fae336ac55d757082a47' 
  AND token = '+xamhzURpSZ0HSCwtoV1IUaMH5YNKmEz87w4LD9U/bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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