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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff4ae3373441c88b9a2f5ffc7e8f6f80e290363575acab60cb7ab4e0b5e68e6' 
  AND token = 'vnDzUlrILJQ6bKaEa6zyA7soUi++ResfTbtZ8LAKSCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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