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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a806b42ba74ae99aca253b605fc2f82f8644dd59d9d06ffdb7de4b3357d19861' 
  AND token = '1dcSIUfln7jIHdseRWri2vLDDr4T7RZYC6d25/o2iLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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