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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac101feb1c2978b9a0093f8f442029ae1fdcc52fc41c17f0118aa65ce0c7cc49' 
  AND token = 'JYqqseoWri+h708lF/ahFPvHl+vtJuypmZDJnvAg9Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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