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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb18e2bf1a722ca5c3e80d864dc134deda7377ab7aa7f22d6bbe5c39e49dec50' 
  AND token = 'Kw9a179VapLueKz2wQvmLzgUvIaligNLsmZO4eypXxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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