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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cad3f3ff45bc362bac10127ba970b48e8aa9a3ba49575779fe01ce5fe76b5bf' 
  AND token = '8dCDjISF30hPRbo2WFdsyyiAREWiMg5kmD0IlTXbP3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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