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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f5ccc375ffb81b8f5a1566f158fcb0e92a19d83cc6011358abfbb6f8515bb2' 
  AND token = 'AtX00JDrDMsbHrW+sXwDwBtsal3atBjR4BliNAZbaQc=' 
  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"
    }
  }
}