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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49611f89954227bcd0775d79d5cc9550af186c2ed9673f68a95e2ed69fe823cc' 
  AND token = 'oWPtwAqTsz3w0DnffN8xtJjMfcw7/pERZ66jtxxUVyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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