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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623bac5b4881b86966d51ff8809989faeb23fda07c87a853722569f7fa8f8d6e' 
  AND token = 'ADcFdXx+d5opGlKf3e5zkVXWX0VX6AdkBqFHIwZ9OSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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