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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff547116130232ba17482da660ffb6015721190ef916a0a3955aaf4d3799bbe' 
  AND token = 'Vw4TbRvc655jG130az/IPSZCK075DefQV7v0Cug/gM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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