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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b3fee5c99425488e9a8c0480278c3bd27b50f440018e76b80f187f2e289920' 
  AND token = 'v8ek/PIVgK91Qh0A3SvcUwFF1R1hg1yo/R/ZdKTHfAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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