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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392b0fc0fa26d11dba7d8d12a1b42cde19edb7d2b9ce86f6f1f0d12b529828cf' 
  AND token = 'TXdyRAJp5xVs7o6po36lUU856BuKOoyCK/b6HL1q4Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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