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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6281c7521c32173ca713349179bfdd85fa5d0e8629fa1dfa99fac9b7a95693b4' 
  AND token = '//N0G/9uqlcgGESVeWqKDgMFasgE0XwNXX4Y7+QyEOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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