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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd5f360822fa38ed7d16044f399fd17ee8872e5bc42216eda37991864720f12' 
  AND token = 'fUspu3DAYyuXMuf4pJE4QljP9M40hen9FRY+w++hxS0=' 
  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"
    }
  }
}