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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd96df1673e607adc69e8171fb8e56d7058ac00d3d477ef7925e1b258f10daed' 
  AND token = '6Gjzn0/V7pZIMtZuCD8gqPxXH0S5v6SEm9NM0YWsC5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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