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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bac048310edcf9e98bd5a77d911e0bf3e840673206ba94593de892164b6de4b' 
  AND token = 'mYe4fERdBBLc4GWaDqUaq/RT6NyQEG+YOPUlbJOb+9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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