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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb258692db597df6d7c09af1b0bdb08ecd21a7ebf20126b1d25d8300a39f853' 
  AND token = '9qL0N9WR6Hx72ZvLRMGZ3UvBsJITgYbh6lBaAdl1kVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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