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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4df8cf8ad4c5a55cf1bd57eef162f2d2e192db32d944b2496888ebe670db26' 
  AND token = 'Nji7d+9r6QHQUcelYPAW/KyPXL3Rpnk66iuD5b3Eq+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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