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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b91b86263cc8c31d3458a68db6cf95563d8afd6f337830e3cf9b7cb5f5002a' 
  AND token = 'vHLfc7O/rN7mkAixHW1wFiNwjuElm3Ys0HwkU8pMIKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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