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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb727a1e0c20b42b5daa586f17b16d11ea50f36f7686c9adab4bdb1a6bc8910d' 
  AND token = 'OwP4q+hqarq4VQkyotAgZtJf6TGiBdxFC/LZRdyiU+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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