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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c30c6c2345b0b56e622702586fcb031344e5a5c71a1824bad04f8a604ff058' 
  AND token = 'q1x4pBP9nyUJ9SaHH1U5rQQ3nAq4FxTw20RO3IcnfRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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