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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de5150f199038d0db2282a3d9b9044230a9a90a3f9703d9555e56d59162bb35' 
  AND token = 'n1HTloVkq2cA53olctWK5kpd+5OdDf2LR6vgDJUezaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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