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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5f42e56ba19aab8a0eaa0dd2366d005979a5442c2a985df26bd8c60f002c25' 
  AND token = 'sugrazjjtd/TSWj/IAEw2MRzpz+WraPE7kbVGx7hpi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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