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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5536a9862e09755885c0a147ac4b30bfa920bf0efdad578b09ce2a74b44e8a59' 
  AND token = 'JU620qgdsfTyeJyNp4KMrKsl7Y2zR6eCB38HiGInNiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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